Flask



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FIG. 1 is a perspective view of the flask showing the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is an exploded perspective view showing the internal components of the flask. 

The ornamental design for a flask, as shown and described. 